Portable drill



I Nov. 4, 1941.

F. SEABOLY 2,261,?46

PORTABLE DRILL Filed July 1940 2 Sheets-Sheet 1 7/ [n ventor fTwr/wr 554504 r Nov. 4, 1941.

F. SEABOLY PORTABLE DRILL Filed July 8, 1940 2 Shets-Sheet 2 EE apt /.9 z;

Inventor fie/WK 515/4301. r

Afiorney Patented Nov. 4, 1941 UNITED STATES PATENT; 5+0F 1 7 2,2e1,'14s 5 I PORTABLE DRILL Frank Seaboly, Centralia, Ill.

Application July 8, 1940, Serial No. 344,440

1 Claim.

This invention relates broadly to portable drills, and more particularly to an attachment for drills of this character whereby the drill may be handled with greater ease and efficiency and will have practically the same advantages as characterize stationary drills.

An object of the present invention is'to provide an attachment particularly designed for portable electric drills whereby the latter may be used with efiiciency for drilling holes in boilers, tanks and the like.

The invention, together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings wherein:

Figure 1 is an elevational view of a portable electric drill having my attachment applied thereto.

Figure 2 is a view taken at right angles to Figure 1.

Figure 3 is a top plan view of the drill with the invention applied thereto.

Figure 4 is a detail sectional view through the gear case, with the gears, rack, and gear shafts shown in elevation.

Figure 5 is a view showing in plan a clamping ring and in horizontal section a gear case to which the ring is secured, and forming part of the invention.

Figure 6 is a sectional view through the rackequipped guide.

Referring more in detail to the drawings it will be seen that 5 indicates generally a conventional portable, or hand electric drill.

In accordance with the present invention there is provided a gear case 6 having a removable cover plate I that is secured in position through the medium of screws or other fastening elements 8.

To one side of the gear case 6 are secured, in any suitable manner, upper and lower split clamps 9 which embrace the casing of the drill 5 in the manner shown in Figure 1, and are positively secured about the casing of the drill 5 through the medium of bolt and nut means l engaged with the ends of the respective split clamps as shown and in a conventional manner.

Adapted for movement through the gear case I parallel to the drill 5 is a rack bar II that at one end has formed integral therewith a curved guide arm I2 equipped with a guide I3 that is in alignment with the drill point as shown in Figure 1.

Mounted on shafts I5 in the gear case are pinion gears I6 that are in constant mesh with the teeth of the rack H and these pinions I6 serve to guide the rack II in its movement through the gear case 6.

Also journaled in the gear case 6 intermediate the shaft I5 is an operating shaft H on which is a relatively large rack gear I8 that is in mesh with the rack II for causing the latter to move through the case 6 in the desired direction.

The respective opposite ends I9 of the shaft IT project outwardly of the case 6 and are squared or otherwise suitably formed to fit conformably within the socket 20 of a crank handle 2I provided for the shaft.

Also, each end I9 of the shaft I I is equipped as at 22 for securing the socket end 20 of the handle 2I engaged with a selected end I9 of the shaft I1. 7

At the free end thereof the rack bar II is provided with a removable head-piece 23 detachably secured thereto through the medium of a screw 24. The head-piece 23 projects laterally beyond the sides of the rack bar II so as to act as a stop for abutment with the top of the gear case 6 to limit movement of the rack bar I I through the case 6 in one direction.

From the above it will be apparent that in the operation of the device the lever 2I is rotated to feed or retract the rack II relative to the gear case 6 whereby to move the guide I3 away from the drill point I5 sufiiciently far to admit the work between the guide I3 and the point I 4. After this has been done the handle 2| is rotated in a reverse direction so as to cause the drill point I4 to move into positive engagement with the work for the purpose of drilling a hole therein.

It will also be seen that the attachment may be readily applied to or removed from the drill 5 as found desirable, and that no alteration of the drill 5 is required for the application of the invention thereto.

It is thought that the advantages of a drill attachment embodying the features of the present invention will be had without a more detailed description thereof.

It is also to be understood that while I have herein shown and described the preferred embodiment of the invention, it is in no wise intended to restrict the invention to the precise details of construction, combination and arrangement of elements as herein shown other than as may be required by the prior art and scope of the claim hereunto appended.

Having thus described the invention what is claimed as new is:

In a device of the class described, a gear case of substantially rectangular shape in cross section and having'one edge open, clamps connected with the other edge and extending therefrom for positively securing the gear case on a portable drill, a cover plate attached to the open edge of the case, a rack bar passing through the case with one edge of the bar engaging the cover 10 plate and the opposite edge having teeth thereon, upper and lower pinions journaled in the case and engaging the teeth of the rack bar,

a large gear in the case and located between the pinions and engaging the teeth of the rack bar, a shaft passing transversely through the case and to which the gear is connected, the ends of the shaft projecting well beyond the sides of the case, a handle, means for detachably connecting the handle to either end of the shaft, the lower part of the rack bar being curved downwardly and outwardly and a guide at the terminals of said curved end, said guide being in alignment with the bit of a drill held by the clamp.

FRANK SEABOLY. 

